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( MbdeL) '3 Shets-Sheet 1.

T J. E. RICHARD.

LATHE ATTACHMENT.

Patented July 4, 1893.

INVE-NTOR 5 WITNESSES:

(No Model.) J E RICHARD 3 Sheets-Sheet 2, LATHE ATTACHMENT N0,.;500,722. PatentedJuly 4, 1893.

INVENTOR:

WITNESSES: a X EZiW 3 Sheets-Sheet 3.

' (No Model.)

J. E. RICHARD. LATHE ATTACHMENT.

No; 500,722. Patented July 4, 1893.

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JNII I I i i fir lN VENTQR:

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WITNESSES:

Attorney.

UNITED STATES PATENT OFFICE.

JEAN E. RICHARD, OF NEWV YORK, N. Y., ASSIGNOR, BY MESNE ASSIGNMENTS, TOJOHN SCOTT, OF SAME PLACE.

LATH E ATTACH M ENT.

SPECIFICATION forming part of Letters Patent No. 500,722, dated July 4,1893.

Application filed July 1, 1892. Serial No. 438,660. (No model.)

To all whom it may concern:

Be it known that I, JEAN E. RICHARD, a citizen of the United States, anda resident of the city, county, and State of New York, have inventedcertain new and useful Improvements in Lathe Attachments, of which thefollowing is a specification.

My invention relates to devices adapted for use on the ordinarymachinists lathe whereby different classes of work may be doneexpeditiously and correctly without the necessity of special machinesfor the purpose; and the object of the invention is to provide anattachment adapted to be fixed on or secured to the tool-post of thelathe, whichwill permit of cutting gears, either plain bevel, oroblique, or of fluting drills and reamers, or of slotting and millingarticles, all as will be more particularly described hereinafter withreference to the accompanying drawings, wherein Figure 1, is an underside plan View of an attachment embodying the principal features of myinvention. Fig. 2, is a rear view of the same, as seen from arrow as, atthe right in Fig. 1. Fig. 3 is a side view, as seen from the arrow y,over Fig. 1. Fig. 4, is a longitudinal section on line a, a, in Fig. 3,and Fig. 5, is a transverse section on line b, b, in Fig. 4. Figs. 6, 7and 8 are detached detail views, which will be hereinafter described.Figs. 9, 10 and 11 are views illustrating an adjustable carriage orholder for articles to be cut or milled, as will be hereinafterdescribed. Fig. 12 shows a chuck holder adapted to replace the mandrelin the carriage, as will be described.

Referring primarily to the first seven figures of the drawings, 1, is abase plate on which is formed an apertured flange 1', to embrace thetool-post of any ordinary machinists lathe. This flange enables theattachment or device to be fixed securely but removably to the tool-postfor convenient use. Secured to the upright face of the base plate 1, bya screw or pin, 2, is a rotatable plate, 3, which turns about the screw2 as a center. The upper faces of the plates 1 and 2, are rounded orconvex concentric with the screw 2, and as represented in Fig. 4, theface of one plate is marked with graduations while the other is markedwith a pointer or index, so that the degree of rotation of the one onthe other may be readily measured. In the plate 3 (see Fig. 3), is aslot 4, concentric with the screw 2, and in the adjacent face of theplate 1, coinciding with said slot, are one or more holes, 5, in whichmav be seta clamping screw, 6, to clamp and hold the plates 1 and 3, inany position they may be set.

In the outer face of the plate 3, is formed a dovetail keeper guide, 7,seen in the detach'ed, sectional view, Fig, "7; and in this keeper guideis mounted a dovetail slide 8, fixed to or forminga part of a holder orcarriage 9. This carriage is adapted to be moved across the face of theplate 3 to any desired extent, and fixed in position when set, by meansof a mechanism best seen in Fig. 5. In the plate 3, parallel with thekeeper guide 7, is a slot 10, in which is mounted a collared adjustingscrew 11, which screws through a square portion of the body of a bolt12, set in the carriage 9, and provided with a nut 12.

The square,12' on the bolts fits and plays in the slot 10. The screw 11,serves to move the carriage in the keeper guide and the bolt 12 servesto clamp it in place when set. Thus it will be seen that the carriage 9,has two adjustments, viz: one rotatively about the screw 2, and theother across the face of the plate 3.

Fig. 4, illustrates the form of holder and feed for the article or thingto be out, as a gear Wheel, (13, in Fig. 1,) for example. Inacylindrical bore in the carriage 9, is rotatively mounted a sleeve, 14,which is collared against endwise movement and provided with a dividingor index plate 14, of the usual kind employed in gear cutters. Mountedon the carriage is the usual spring finger and point, 14 used inconnection withthe plate 14. Mount ed to slide longitudinally in thesleeve 14, is the arbor 15, which carries the gear to be cut. This arboris compelled to turn with the sleeve 14 by means of a stud, 15, on thearbor (see detached view Fig. 6) which engages a slot, 14 ,in the sleeve14. Longitudinal movement is imparted to the arbor 15, by a screw 16,

' which has collared bearings and is provided with a crank 15", seen inFig. 1. This crank is removable and I have omitted it from Figs.

2 and 3.

The operation of the attachment described, for cutting gears or likework, is as follows: A cutter or milling tool is mounted on the lathespindle, and the blank, as 13 in Fig. 1, is secured on the end of thearbor 15, the attachment having been previously secured to the tool postof the lathe. If the gear to be cut is a spur gear, the axis of thearbor 15 will usually be arranged horizontally, and the carriage be setat the proper height for the milling tool or cutter to cut to thedesired depth when the gear blank 13, is moved over it by the feed screw16. After the plate 14, has been set, the sleeve 14, is held firmagainst rotation during the feeding operation by a screw 17, and aclamping shoe, 17, (see Fig. 5) which is slipped into a mortise in thecarriage and has a concave face where it bears on the sleeve. This shoeis interposed between the screw 17 and the sleeve.

If the gear to be cut is a spiral or skew gear, the slot, 14 in thesleeve will be spiral, as seen in Fig. 8, which shows this feature. Ihave shown a sleeve with a straight slot in Fig. 6, and one with aspiral slot in Fig. 8, but it will be obvious that the same sleeve mayhave both a straight and a spiral slot in it, on opposite sides, so thateither can be used at will; or it may have two or more spiral or helicalslots of different pitches. This arrangement of several slots in thesame sleeve is too obvious to require illustration, and is within theknowledge and skill of any good workman who can construct such a device.Twist drills, straight fluted drills,fluted reamers, and all work ofthis character may be constructed with this attachment. For cuttingbevel gears, or any beveled work, the plate 3 will be turned about thescrew 2 and set at the proper angle, and the feed effected by means ofthe regular tool feed of the lathe; that is, the whole attachment willbe fed transversely of the lathe bed by means of the tool post and itscarriage.

In Fig. 12 I have shown a mandrel 15, to replace the mandrel 15. Thismandrel 15 is adapted to hold a chuck, and is useful for some kinds ofwork. To use this chuck mandrel it is only necessary to take out thesleeve 14 with the mandrel 15 inclosed, and then remove the mandrel 15and replace it by the chuck mandrel.

The carriage 9 being readily removable from the keeper guide in plate 3,this carriage may be taken oh? and another carriage for a differentclass of work substituted for it. I have shown such a device in Figs. 9,10 and 11. This device comprises an adjustable carriage or holder for apiece to be slotted or milled, Fig. 9, being a face view of the clampingplate, and Fig. 10, a section of the same on line a, z, in Fig. 9. Fig.11, is a plan View of the holder, showing it mounted in the keeper guideof plate 3.

The holder plate 18, is provided with a dovetail slide 18', which fitsand plays in the dovetail keeper guide in plate 3, wherein it is clampedwhen once adjusted, by means of a screw or screws 25, seen in Fig. 11,which screw into the edge of the plate 18. To this plate 18, is hingedat 18", a plate 19, provided with pivoted clamp jaws, 20 and 20*. Theseclamp jaws are pivoted respectively, on bolts, 21, which engage a slot,22, in the plate 19, and the clamping is effected by screws, 23, whichbear on the jaw 20 at opposite sides of its pivot. The plate 19 may beset and fixed at any angle with the plate 18, by means of curved andslotted guides 24, secured to the opposite ends of plate 19, andengaging clamp screws 24' set in the plate 18. The guides 24 arerepresented in Fig. 11, as graduated.

In Figs. 9 and 10, X represents a beveled piece as clamped in the jawsof the carriage or holder.

Having thus described my invention, 1 claim 1. In a lathe attachment,the base plate 1, provided with an apertured flange 1 for attachment tothe tool post of the lathe, the plate 3, rotatably mounted on the plate1, and provided with a dovetail keeper guide to receive a carriage forthe piece to be operated on, the said carriage, means substantially asdescribed for holding the piece on the carriage, means substantially asdescribed for securing the carriage in the keeper when set, and aclamping mechanism for securing together the plates 1 and 3 when set,substantially as described and shown.

2. In a lathe attachment, the combination with the base plate 1,provided with an apertured flange l for attachment to the toolpost of alathe, the plate 3, pivotally mounted on the face of plate 1, andprovided with a keeper guide to receive a carriage or holder, means forclamping the plates 1 and 3 together when adjusted the carriage 9,mounted in the keeper guide in plate 3, and means for adjusting andsetting the carriage in said guide, of the slotted sleeve 14, rotativelymounted in the carriage and provided with an index plate 14, the springfinger and point for use in connection with said plate, the arbor 15,mounted in said sleeve and provided with a stud which engages the slotin the sleeve, and the collared feed screw, 16, mounted in the carriageand adapted to move the arbor longitudinally, substantially as setforth.

3. In a lathe attachment for helical fluting, and the like thecombination with the carriage 9, having in it a longitudinal bore, ofthe sleeve 14, rotatively mounted in said bore and provided with ahelical slot as set forth, means substantially as described formeasuring the degree of rotary movement imparted to said sleeve at eachsetting, means substantially as described for clamping said sleeve inplace in the carriage, a longitudinally sliding arbor 15, mounted insaid sleeve and provided with a stud which engages the slot in thesleeve, and a feed-screw 16, collared in its bearings and engaging afemale screw in the arbor, substantially as set forth.

4:. In alathe attachment, the combination with a plate, as 8, having init'a dovetail guide, of a carriage or holder comprising a plate 18,provided with a slide which engages said dovetail guide, means forclamping said slide in the guide, a plate 19, hinged to plate 18 andhaving slotted guides 24, means for clamping said guides to the plate18, and adjustable, pivoted clamp jaws, 20 and 20 mounted on the plate19 for clamping thereon 10 the piece to be milled.

In witness whereof I have hereunto signed my name in the presence of twosubscribing witnesses.

JEAN E. RICHARD. Witnesses:

HENRY CONNETT, ANDREW CoMsTooK.

